I want to replace the faucet washers and seats in a 35 year old stall shower. I can't get the seats off (i think they're original). The inside of the seats seems to have rounded out and the wrench will not grab. I also noticed metal shavings on the wrench so I stopped. I then used a seat tool to try and smooth out the seat, but could not get it very smooth, plus I was afraid of removing to much of whats left of the seat. I put everything back together so I could turn the water in my house back on, but now it drips worse than before. If I use an easy-out, how much danger is there in cracking the part the seat screws into? Thanks for any advice you can give.